World's most polluted cities

Severe pollution is once again choking Shanghai and other cities in China, disrupting hundreds of flights and forcing schools to close. China is home to some of the world's most polluted cities -- take a look at some of the others.

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Kasaragod, India -- The organic pesticide endosulfan is now banned in many countries, but 20 years of spraying it over cashew plantation in Kasaragod has taken its toll. Numerous congenital, reproductive and long-term neurological and other effects have been experienced, including congenital deformities, cerebral palsy, epilepsy, lowered IQ, delayed development and cancer, according to ABC Environment.